PDF malware analysis — malicious · bb161b12d095a0ab

MALICIOUS

PDF

39.7 KB Created: 2020-08-31 04:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0aef4ed9798bbd5e30d5cdd44879af0e SHA-1: 26f86398db2eee41f8b382ef125007196364a1fa SHA-256: bb161b12d095a0ab22c659f6b7c79370c89410bb0c35380c027ef187aa1867b2

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a high number of embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the malicious URL. The presence of numerous links suggests a link farm or phishing attempt, aiming to lure users to external, potentially harmful, sites.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ttraff.ru/wix?keyword=trabajo+abstracto+y+concreto
- https://cdn.shopify.com/s/files/1/0431/7764/0092/files/service_coordinator_interview_questions_answers.pdf
- https://cdn.shopify.com/s/files/1/0440/2606/9157/files/xekilupojuxojizebukazum.pdf
- https://cdn.shopify.com/s/files/1/0437/9279/3757/files/carburetor_download.pdf
- https://static.usrfiles.com/ugd/b8c837_66c3b32e43b14a329f38f6bb90c72a2d.pdf
- https://static.usrfiles.com/ugd/b8c837_9ea3d980ff6543108276bffef1ef21bd.pdf
- https://static.usrfiles.com/ugd/1df9ea_6ce85685974d40a99a6568a238761633.pdf
- https://cdn.shopify.com/s/files/1/0428/3187/2166/files/golizap.pdf
- https://cdn.shopify.com/s/files/1/0462/6006/0314/files/36938685971.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigirerunozekolufis.pdf
- https://cdn.shopify.com/s/files/1/0432/3419/7666/files/bodbot_pro_apk.pdf
- https://static.usrfiles.com/ugd/3aca14_6eeeb72611a64507aad339a710b9778d.pdf
- https://static.usrfiles.com/ugd/a91264_5f941fc656d449f7b040ea45320cdccc.pdf
- https://static.usrfiles.com/ugd/57c819_1ff2faf32a194d4aaec825ee97d69de6.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005f40.bin` `aa5ebb98baceba59fc6d0778dc91114f7a1f2d25d3b3ba9bea3f033aae1a2f52`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F40	5028 bytes
`font_01_sfnt_off00007074.bin` `7543ec3359062bced120a5832744f657db5c2f124077e83443c595474a24db67`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7074	10416 bytes

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